It's not as expensive as it looks, Starship plus booster costs around 100 million. A Saturn V Apollo mission cost 185 million in 1969 which, according to https://en.wikipedia.org/wiki/Saturn_V#Cost, would now be a bit less than a billion dollars.
Also, SpaceX is not building rockets, they are building a rocket factory. If they succeed they will have lowered the cost of putting stuff into space by an order of magnitude. The potential rewards are huge.
Also, SpaceX is not building rockets, they are building a rocket factory. If they succeed they will have lowered the cost of putting stuff into space by an order of magnitude. The potential rewards are huge.